Electronic copying machine

ABSTRACT

An electronic copying machine having a cutter for photosensitive paper and a sensor for detecting front and rear edges of an original so as to ensure smooth movement of the original while eliminating the risk of erroneous operation. The photosensitive paper is fed continuously, and the cutting means cuts the photosensitive paper at a certain minimum length L when the original is not longer than L, while cutting the photosensitive paper at a length corresponding to the length of the original when the original is longer than L.

United States Patent Tanaka et al.

[ 51 Jan. 25, 1972 [54] ELECTRONIC COPYING MACHINE [72] lnventors:Toyoki Tanaka, Osaka; Yutaka lrle,

Tovokawa, both of Japan [73] Assignee: Minolta Camera Kabushlki Keisha,Osaia,

Japan a [22] Filed: Oct. 6,1969

21 Appl. No.: 864,057

[30] Foreign Application Priority Data Oct. ll, 1968 Japan ..43/89l07Oct. ll, 1968 Japan ....43/ 89]08 [52] US. Cl ..355/l3, 355/28, 355/295: 1m. 01. .0035 29/00 581 Field of Search ..35s/2s, 29,13; 83/203, 205;200/166 BB [56] References Cited UNITED STATES PATENTS 3,398,619 8/1968Nichols .83/36 4X Powell ..200/5 E Primary Examiner-Samuel S. MatthewsAssistant Examiner-Michael Harris A!t0rneyStanley Wolder [571 j ABSTRACTAn electronic copying machine having a cutter for photosensitive paperand a sensor for detecting front and rear edges of an original so as toensure smooth movement of the original while eliminating the risk oferroneous operation. The photosensitive paper is fed continuously, andthe cutting means cuts the photosensitive paper at a certain minimumlength L when the original is not longer than L, while cutting thephotosensitive paper at a length corresponding to the length of theoriginal when the original is longer than L.

PATENTEDJANZSIQYZ 3.637.305

SHEET NW 3 INVENTORS 7070K! Inn/4M4 Jul aim PATENTEDmzsmz 3.637.305SIEET 20F 3 INVENTORE'S Taro/a m/mx/y yam/m 12/5 Pmamsnmzsmz 3,637,305

INVENTORS rayo/ mu /m9 Y yurorn lE/E Mum- .tion, the photosensitive 1ELECTRONIC COPYING MACHINE This invention relates to an velectroniccopying machine srtrve paper continuously while automatically cutting itat a length corresponding to the length of the original being copied.'In a conventional copying machine using a rolled photosensitive paper,a dial is provided for, setting the length at which the photosensitivepaper is cut, and the dial is manually set for each original to becopied so as to cut the photosensitive paper at a length correspondingto the length of the original being copied. Such manual setting istroublesome. Furthermore, if

the'paperdimension of the original is one ofthe standardized sizes, thesetting of the aforesaid manual dial can bemade comparativelyeasily, byusing standard scales. 'If the original is, however, of nonstandardsize, the operator must take accurate measurement of it. Exact settingof the manual dial is not necessarily easy for such nonstandard sizepaper. In addition, should the photosensitive paper be cut-too short,smooth feeding of the photosensitive paper is hampered to cause thecopying machine to be clogged with the paper.

Therefore, an object of the present invention is to provide anelectronic copying. machine which obviates the aforesaid difficulties ofthe conventional copying machine. With the electronic copying machineaccording to the present invenpaper is automatically cut at a lengthcorresponding to the length of each original being copies, so that therewill be no waste of copying paper. In the electronic copying machine ofthe invention, troublesome manual setting is not necessary at all, andtherisk of clogging with paper is completely eliminated, because smoothfeeding of the photosensitive copying paper is ensured by cutting it ata length longer than a minimum length which is long enough for thesmoothfeeding even if the original being copied is extremely short.

Another object of the present invention is to provide an electroniccopying machine which accurately detect front'and rear edges of anoriginal being copied for efiecting automatic cutting of photosensitivecopying paper at a' length -corresponding to the length of the originalbetween the front and rearedges thus detected. For this end, a pair ofelectrically conductive sensing rolls are disposed in mutually.engageable fashion, and a capacitor is connected in parallel with thesensing rolls in such manner that smooth feeding of the original throughthe copying machine is ensured while eliminating the risk of erroneousoperation thereof.

Other objects and afuller understanding of the present invention maybehad by referring to the following description and claims, taken inconjunction with the accompanying drawings, in which:

FIG. 1 is a schematic sectional view of an electronic copying machine,according to the present invention;

FIG. 2 is a electric circuit diagram of the copying machine;

2: original 7, of course, moves in s'ynchronism with the copying paper.Light beams from a light source I become incident to the original 7 soas to be reflected by the original toward the image receiving section28. Anopticalsystem 2 is provided in the passage of the reflected light'beams in'such manner that a well focused image of the'original is formedat the image receiving section 28. A cutter 5 located in the proximityof the feeding rolls 10 for cutting the photosensitive Copyi'ngpaper.

A pair of electrically conductive'sensing rolls 8, 9 are normally keptin contact with each other to carry an electric current through the'conta'ctbetween"' them. The electric current through the contactbetween'the sensing rolls 8, 9 are interrupted upon entrance of theoriginal 7 therebetween, so that the front'and rear edges of theoriginal can accurately be detected by checking the current through therolls 8, 9. i

In a control system of the electronic copying machine, of which circuitis shown in FIG; 2', relay contacts are designated by adding symbols Cto numerals representing relays to which the relaycontactsbelong.Operative positions of the relay contacts, which are shown by solidlines in the FIGURE,

represent their normal positions to be assumed before the conthe currentthrough the 'relay2tl, to open the relay contact 20C] while closinganother relayfj'contact 2002. Accordingly,

the capacitor 21 is'discharged through a circuit consisting of the relaycontact20C2 and a'holding relay 22. The holding relay 22 is energized toopen the relay contact 22Cl while closing another relay contact 22Ci2.As a "result of ,it, an electromagnet. I8 is actuated, an a magneticclutch 23 is engaged I to drive a means for delivering the'photosensitivecopying FIG. 3 is a schematic elevation of the actuatingmechanism of a photosensitive copying paper cutter usable in theelectronic copying machine, showing essential portions thereof;

FIG. 4 is a vertical sectional view thereof;

FIG. 5 is a view similar to FIG. 1, illustrating another embodiment ofthe present invention;

FIG. 6 is a schematic perspective view of a detector for sensing thefront and rear edges of an original being copied, which is usable in theelectronic copying machine according to the present invention; and

FIG. 7 is a circuit diagram of the detector.

Referring to FIG, 1, showing a schematic vertical sectional view of anelectronic copying machine, according to the present invention, anoriginal 7 being copied is fed by rollers 29 in a direction depicted bythe arrow 7. toward the outside of the copying machine, Photosensitivecopying paper is delivered from a copying paper roll 6 to feeding rollsl0, and fed through a charger 3, an image receiving section 28 and ahereinafter. A microswitch 19 paper for starting the feeding of thecopying paper. Theelectromagnet l8 actuates a delay means,- to bedescribed I turns its contact element to a dotted line position at theend of a certain predetermined delay time for energizing a holding delay24. Being energized, the holding relay 24 closes its contacts 2 Cl.While opening another relay contact 24C2 for deenergizing theelectromagnet 18. H

An AND-circuit 30 is inserted,' in series, between relay concts 24C] and20C3. The relay contact 20C3 is kept openas long as the relay 20 isdeene'r'gized by the presence of the original 7 by the sensing rolls 8and 9. Thus, the AND circuit closes only when the following twoconditions are simultaneously established: namely, the elapse of theaforesaid delay time, and the resumption of electrical currentthroughthe relay 20 upon leaving of the original 7 from he sensing rolls8, 9

After the relay contact 24CI closes the elapse of the delay time, whenthe relay 20 is reenergized to close the relay contact 20C3 in responseto the passage of the original 7 from the sensing rolls 8, and 9, arotary solenoid 25 is actuated. The rotary solenoid drives the cutter 5.At the same time, the rotary solenoid 25 turns the contact element of amicroswitch 26 to its dotted line position, for energizing a holdingrelay 24', so as to return the holding relay 24 to is original position.Accordingly, the relay contact 24C! opens to deenergize the rotarysolenoid 25 for returning the microswitch 26 to its original position.Before the relay contact 24C3 opens, a hold?- ing relay 22 is energizedthrough a contact 20C4 of the relay 20 which now carries an electriccurrent, so asto return the holding relay 22 to its original position.Asa result, the relay contact 22C2 opens, to interrupt the currentthrough the magnetic clutch 23. Thus, the delivery of the photosensitivecopying paper stops, and the charging of the capacitor 21 resumes.Thereby, the electronic copying: machine returns to the originalposition ready for receiving a next original 7. V 7

FIGS. 3 and 4 illustrate the time delay means. In the FIGURES, a camdisk 12 is driven at a reduced speed by a prime mover of the copyingmachine. The cam disk 12 frictionally engages the boss 31 (FIG, 4) of acontinuously rotating gear 11 in such manner that the cam disk 12 canfrictionally slip relative to the boss 31. A lever 17 normally holds thecam disk 12 stationary be the engagement of the righthand end of thelever 17 and a projection 27 of the cam disk 12, as shown in FIG. 3.Upon energization, the electromagnet 18 turns the lever 17counterclockwise, as seen in figure so as to disengage the lever 17 fromthe projection 27 of the cam disk 12. Accordingly, the cam disk 12starts rotating together with the gear 11 by being driven by thefriction between the disk and the boss in a direction as shown by thearrow of FIG. 3. A pin 16 is secured to the cam disk 12, so that the pin16 engages an actuator arm of the microswitch 19 in response to therotation of the cam disk 12 by a certain predetermined angle. When hepin 16 engages the actuator arm, the contact element of the microswitch19 moves from the solid line position to the dotted line position, asshown in FIG. 2. Then, the electromagnet 18 is deenergized to return thelever 17 to the position as illustrated in FIG. 3, where the leverengages the projection 27 of the cam disk 12 as the cam rotates.

The cam disk 12 is carried by a gear 11 between a pair ofabrasion-resisting washers l3 and 14 mounted on the gear. The washersl3, 14 are made of nylon or other suitable resilient material. A spring15 is so disposed as to cause the two washers 13, 14 to engage theopposing surface of the cam disk 12 while allowing the cam disk 12 tofrictionally slip relative to the gear 11.

The delay time of the aforesaid delay means is so selected that thelength of the photosensitive copying paper which is fed during the delaytime becomes minimum length L, which ensures smooth feeding thereofthrough the electronic copying machine. As pointed out in the foregoing,the cutter is actuate only when the two relay contacts 20C3 and 24C1 aresimultaneously closed, thanks to the AND-circuit 30. Accordingly, if thelength of the original 7 being copied is not longer than the minimumlength L, which is required for smooth feeding of the copying paper, thetwo relay contacts close in the order of 20C3 and 24C1, as can easily beseen from he circuit diagram of FIG. 2. Thereby, the copying paper iscut at a length equivalent to the minimum length L.

On the other hand, when the original 7 is longer than the minimum lengthL, the two relay contacts are closed in the order to 24C1 and 20C3, andthe copying paper is cut at a length corresponding to the length of theoriginal 7, as can easily be seen from the circuit diagram of FIG. 2.

In the illustrated embodiment, the magnitude of the minimum length L canbe adjusted by properly selecting'or varying the reduction ratio betweenthe gear 11 and the cam disk 12 and varying the angular position of thepin 16 on the cam disk 12. V

In order to prevent overlapping of successive originals 7 in theelectronic copying machine, it is possible to mount an indicating lamp(not shown) which is actuated by the rotary solenoid 25. With suchindicating lamp, the operator can feed an original 7 into the copyingmachine only after completion of the copying operation of the precedingoriginal 7 with the cutting of the copying paper by the cutter 5, sothat no overlapping of the originals occur in the copying machine.

FIGS. 5 to 7 illustrate a second embodiment of the present invention, inwhich like parts are designated by like reference numerals as in thepreceding embodiment, which is described by referring to FIGS. 1 to 4.In FIG. 5, an original 7 is fed through an inlet opening 32. Feedingrolls 33 and 34 transfer the original 7 thus fed in a direction as shownby the arrow 7. At the same time, the original 7 passes between a pairof electrically conductive sensing rolls 8 and 9; so as to interrupt anelectric current between the rolls 8 and 9 as long as the original 7 isbetween them. Accordingly, the front and rear edges of the original canbe sensed by the interruption and resumption of the electric currentthrough the two sensing rolls 8 and 9. Delivery rolls deliverphotosensitive copying paper from a rolled copying paper 6 and feeds thecopying paper in a direction as shown by the arrow 6, so that thecopying paper travels through a cutter 5, a charger 3, feeding rolls 35,an exposing portion 28, and a developing tank 4.

The delivery of the photosensitive copying paper is initiated by anelectric signal which is generated in response to the detection of thefront edge of the original 7 at the electrically conductive sensingrolls 8 and 9. The feeding speed of the copying paper is identical withthat of the original 7., As soon as an end signal is generated inresponse of the detection of the rear edge of the original 7 by therolls 8 and 9, the cutter 5 is actuated by the end signal to cut thecopying paper. Accordingly, the copying paper is cut at a lengthcorresponding to the length of the original, provided that the copyingpaper is not cut shorter than a certain minimum length L.

When he copying paper moves through the image receiving section 28 atthe same speed with that of the original 7, in synchronism with thearrival of the original 7 at a scanning section A, beams from a lightsource 1 reflect at the original 7 and pass through an optical system 2,which produces a well focused image of the original 7 on thephotosensitive paper at the image-receiving section 28.

The electrically conductive sensing rolls 8 and 9 need not be as wide asthe feeding rolls 33 and 34 of the originals. For instance, the rolls 8and 9 can be a pair of electrically conductive wheels disposed at aboutthe lateral center of the original 7 with respect to the movingdirection of the original, as depicted in FIG. 6. The sensing rolls 8and 9 can be made of metallic material or can be provided withelectrically conductive rubber rings mounted on the peripheries thereof.In a preferred embodiment of the invention, one of the sensing rolls,e.g., the roll 9, is driven together with the feeding rolls 33, whilethe other sensing rolls, e.g., roll 8, is resiliently urged by a leafspring 36 toward the first sensing roll 9 so as to cooperate with thefirst sensing roll 9.

Referring to FIG. 7, illustrating a control circuitof the embodiment ofFIG. 5, a relay 37 is connected to the sensing rolls 8 and 9, in seriestherewith. A direct current source 38 normally maintains an electriccurrent through the relay 37 and the sensing rolls 8 and 9. A shuntcircuit consisting of a capacitor 40 in series with a resistor 39 isconnected across the pair of the sensing rolls 8 and 9. Another shuntcircuit consisting of a capacitor 42 in series with a resistor 41 isconnected across the relay 37. Upon insertion of the original 7 betweenthe sensing rolls 8 and 9, the current through the relay 37 isinterrupted to close a relay contact while opening another relay contact44. Accordingly, a magnetic clutch 45 is actuated to start the deliveryof the photosensitive copying paper. At the same time, a cutter driverelectromagnet 46 is deenergized. Upon passage of the original 7 throughthe sensing rolls 8 and 9, the current is resumed through the rolls 8, 9and the relay 37 to open the contact 43 while closing the contact 44.Accordingly, the clutch 45 is released and the cutter 5 is actuated.

The capacitor 40 in the aforesaid control circuit is to preventerroneous operation of the electronic copying machine. When the currentthrough the sensing rolls 8 and 9 is momentarily interrupted by somereasons, for instance, by vibration from the outside of the machine ormomentary intrusion of foreign matters between the sensing rolls, thecapacitor 40 is charged by the power source 38 through the relay 37, ascan be seen from FIG. 7 and the charging current acts to hold the relayas energized. Thus, the electronic copying machine is not susceptible toerroneous operation due to momentary interruption of the electriccurrent through the sensing rolls 8, 9.

The capacitor 42 in parallel with the relay 37 functions as follows. Asexplained in the above, immediately after the current through thesensing rolls 8 and 9 is interrupted, the capacitor 40 dischargesthrough the relay 37 for holding the relay 37 for a certain period oftime. In other words, the capacitor 40 provides a certain time lag fromthe interruption of the current through the sensing rolls to thedeenergization of the relay 37. This time lag is selected to be at acertain value which is not too short for the purpose to be describedhereinafter. Referring to FIG. 5, in order to compensate for such timelag, the distance between the sensing rolls 8, 9 and the scanningsection A along the travelling route of the original 7 is selected to besomewhat shorter than the distance from the cutter 5 to animage-receiving section B. The latter distance is taken along thetravelling route of the copying paper. It is, however, usually difficultto establish good matching between the aforesaid time lag and the routelength difference, because of the manufacturing errors of variousmechanical parts of the machine and the dispersion of electrical circuitconstants. Accordingly, the aforesaid route length difference isselected to be somewhat longer than the value corresponding to the timelag due to the capacitor 40. By adof a time lag due to the capacitor 42by varying the resistance value of the resistor 41, exact matching canbe easily established between the total time lag, inclusive of those dueto the capacitors 40 and 42, and the aforesaid route length difference.

In conventional copying machine with rolled copying paper, a microswitchwith a low present invention. Such microswitch had various namely, thinoriginals were folded and wrinkled,

drawbacks,

cooperating sensing rolls is completely eliminated by the use ofcharging current of such shunt capacitor. With the copying machine ofthe present invention, the risk of wrinkling of thin originals is alsocompletely eliminated by the use of the sensing rolls.

Furthermore, by mounting electrically conductive rubber ring on theperipheries of the sensing rolls 8, and 9, the operation of the copyingmachine is stabilized against vibration from he outside. By using ashunt capacitor with a series resistor whose resistance value isvariable, in parallel with the relay 37, the mechanical compensation ofthe electrical time lag at the sensing means for detecting the front andrear edges of the original can be greatly simplified.

Although the present invention has been described with a certain degreeof particularity, it is understood that the present disclosure has beenmade only by way of example and that numerous changes in details ofconstruction and the combination and arrangement of parts may beresorted to without departing from the spirit and scope of the inventionas hereinafter claimed.

What is claimed is:

1. An electronic copying machine comprising a sensing means fordetecting front and rear edges of an original being copied and first andsecond signals in response to the passage of said front and rear edgesrespectively, a delaying means for generating a third signal apredetermined time after said first signal and corresponding to aminimum length of the copying paper, a photosensitive copying paperdelivering means connected to said sensing means and actuated by saidfirst signal, a paper cutter for automatically cutting the copyingpaper, and an AND circuit connected to said sensing means and saiddelaying means and actuated by the simultaneous existence of said secondand third signals for stopping said copying paper delivering means andactuating the copying paper cutter.

2. An electronic copying machine according to claim 1, wherein saidsensing means comprising a pair of electrically conductive sensing rollswhich are in resilient contact with each other, so as to carry anelectric current through the contact therebetween, an a capacitorconnected across said pair of rolls.

trol lever from said projection upon actuation thereof, and amicroswitch cooperating with said pin.

4. An electronic copying machine according to claim 1 and furthercomprising a relay connected in series with said sensing rolls and acapacitor with a series resistor connected across said relay, resistanceof said resistor being adjustable, whereby a time lag inherent to saidsensing means can finely be adjusted to facilitate mechanicalcompensation of the time lag.

5. An electronic copying machine according toclaim 2, wherein said pairof sensing rolls are made of electrically conductive rubber, wherebyoperation of the copying machine is stabilized against vibration fromthe outside of the machine.

6. An electronic copying machine according to claim 3, wherein saidcutter is so actuated that the copying paper is automatically cut by thecutter at a length longer than a certain minimum length which isadjustable by varying speed change ratio between said gear and said camdisk of said pin relative to said cam disk.

7. An electronic copying machine, comprising a means for sensing aleading edge and a trailing edge of an original said means having acontrol means for compensating the time lag of said sensing means atdetecting the leading edge and trailing edge of the original, a meansfor delivering a copy paper from a copy paper roll, said deliveringmeans connected to said reversing means and being actuated on receivinga first signal generated by said sensing means when the latter sensesthe leading edge of the original, a cutting means for the copy paper, anelectromechanical means having a delaying means for controlling theoperation of said cutting means so as to cut the copy paper to apredeterminedminimum length, said electromechanical means connected tosaid sensing means and being actuated upon receiving said first signal,and an AND closed by said delaying means at the expiration of thepredeten'nined delay time by said delaying means, and a second switchwhich is closed upon receiving a second signal generated by said sensingmeans when the latter senses the trailing edge of the original said ANDcircuit cooperating mechanically and electrically with said deliveringmeans and cutting means so that upon completion of said AND circuit,said delivering means and cutting means are stopped and actuatedrespectively, said AND circuit being completed when said first andsecond switches are closed, to stop the delivering means and to actuatethe cutting means,

8. An electronic copying machine as claimed in claim 7, wherein saidsensing means comprises a pair of electrically conductive sensing rollswhich are in resilient contact with each other so as to carrycompensating said time lag, and also connected thereacross to a relaywhich is actuated to actuate said delivering means upon receiving saidfirst signal, and to stop and actuate said first signal, said pinactuating a microswitch which closes the switch (24C1) after the camdisk is revolved at a p'redeter said electromagnetic means is energizedupon receiving said 10 mined angle.

11. An electronic copying machine as claimed in claim 10, includingmeans for varying the velocity ratio between said prime mover and camdisk, and for varying the angular position of said pin relative to saidcam disk.

12. An electronic copying machine as claimed in claim 8, wherein acapacitor and a resistor connected in series therewith are connected inparallel with the relay, the resistance of said resistor being adjustedto facilitate mechanical compensation of the time lag.

1. An electronic copying machine comprising a sensing means fordetecting front and rear edges of an original being copied and first andsecond signals in response to the passage of said front and rear edgesrespectively, a delaying means for generating a third signal apredetermined time after said first signal and corresponding to aminimum length of the copying paper, a photosensitive copying paperdelivering means connected to said sensing means and actuated by saidfirst signal, a paper cutter for automatically cutting the copyingpaper, and an AND circuit connected to said sensing means and saiddelaying means and actuated by the simultaneous existence of said secondand third signals for stopping said copying paper delivering means andactuating the copying paper cutter.
 2. An electronic copying machineaccording to claim 1, wherein said sensing means comprising a pair ofelectrically conductive sensing rolls which are in resilient contactwith each other, so as to carry an electric current through the contacttherebetween, an a capacitor connected across said pair of rolls.
 3. Anelectronic copying machine according to claim 1, and further comprisinga continuously rotating gear with a boss integrally formed therewith atthe center thereof, wherein said delaying means consists of a cam diskhaving a peripheral projection and a pin integrally secured thereto,said cam disk being mounted on said boss of said gear by means of aspring and washers in such manner that the cam disk can frictionallyslip relative to the gear, a control lever engageable with saidprojection, an electromagnet adapted to disengage said control leverfrom said projection upon actuation thereof, and a microswitchcooperating with said pin.
 4. An electronic copying machine according toclaim 1 and further comprising a relay connected in series with saidsensing rolls and a capacitor with a series resistor connected acrosssaid relay, resistance of said resistor being adjustable, whereby a timelag inherent to said sensing means can finely be adjusted to facilitatemechanical compensation of the time lag.
 5. An electronic copyingmachine according to claim 2, wherein said pair of sensing rolls aremade of electrically conductive rubber, whereby operation of the copyingmachine is stabilized against vibration from the outside of the machine.6. An electronic copying machine according to claim 3, wherein saidcutter is so actuated that the copying paper is automatically cut by thecutter at a length longer than a certain minimum length which isadjustable by varying speed change rAtio between said gear and said camdisk and angular position of said pin relative to said cam disk.
 7. Anelectronic copying machine, comprising a means for sensing a leadingedge and a trailing edge of an original, said means having a controlmeans for compensating the time lag of said sensing means at detectingthe leading edge and trailing edge of the original, a means fordelivering a copy paper from a copy paper roll, said delivering meansconnected to said reversing means and being actuated on receiving afirst signal generated by said sensing means when the latter senses theleading edge of the original, a cutting means for the copy paper, anelectromechanical means having a delaying means for controlling theoperation of said cutting means so as to cut the copy paper to apredetermined minimum length, said electromechanical means connected tosaid sensing means and being actuated upon receiving said first signal,and an AND circuit connected to said sensing means and said delay meanshaving a first switch which is closed by said delaying means at theexpiration of the predetermined delay time by said delaying means, and asecond switch which is closed upon receiving a second signal generatedby said sensing means when the latter senses the trailing edge of theoriginal, said AND circuit cooperating mechanically and electricallywith said delivering means and cutting means so that, upon completion ofsaid AND circuit, said delivering means and cutting means are stoppedand actuated respectively, said AND circuit being completed only whensaid first and second switches are closed, to stop the delivering meansand to actuate the cutting means.
 8. An electronic copying machine asclaimed in claim 7, wherein said sensing means comprises a pair ofelectrically conductive sensing rolls which are in resilient contactwith each other so as to carry an electric current therethrough, saidsensing means being connected thereacross to a capacitor forcompensating said time lag, and also connected thereacross to a relaywhich is actuated to actuate said delivering means upon receiving saidfirst signal, and to stop and actuate said delivering means and cuttingmeans respectively upon receiving said second signal.
 9. An electroniccopying machine as claimed in claim 7, wherein said electromechanicalmeans includes an electromagnetic means and the delaying means, saidelectromagnetic means being actuated upon receiving said first signal tostart the delaying means which compensates the predetermined minimumlength of the copy paper to be delivered from the copy paper roll. 10.An electronic copying machine as claimed in claim 7, wherein saiddelaying means comprises a cam disk having a peripheral projection and apin integrally secured thereto, said cam disk being mounted on a base ofa gear, which is continuously driven by a prime mover through a gearbox,by means of a spring and washers in such manner that the cam disk canfrictionally slip relative to said gear, said peripheral projectionbeing interlocked with the electromagnetic means by means of a leverwhich is normally engaged with said projection, the engagement betweenthe lever and projection being disengaged together with to initiate therotation of said cam disk when said electromagnetic means is energizedupon receiving said first signal, said pin actuating a microswitch whichcloses the switch (24C1) after the cam disk is revolved at apredetermined angle.
 11. An electronic copying machine as claimed inclaim 10, including means for varying the velocity ratio between saidprime mover and cam disk, and for varying the angular position of saidpin relative to said cam disk.
 12. An electronic copying machine asclaimed in claim 8, wherein a capacitor and a resistor connected inseries therewith are connected in parallel with the relay, theresistance of said resistor being adjusted to facilitate mechanicalcompensation of the time lag.